Threat description


Category: Malware
Type: Worm
Platform: W32
Aliases: Amus.A, I-Worm.Amus.a


Amus was found on 5th of August 2004. It's a simple massmailer written in Visual Basic.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.


More information on scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

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Technical Details

Amus is packed with Yoda. It's packed size is 51782.

Once executed it creates a a mutex named "Masum". In order to avoid being run more than once. And copies itself to


It drops copies of itself in the Windows folder with names from:

Messenger.exe  My_Pictures.exe  Meydanbasi.exe  Pide.exe  Pire.exe  Cekirge.exe  Ankara.exe  Adapazari.exe  Anti_Virus.exe  KdzEregli.exe  

A registry key will be set to point to one of the dropped files:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\]  "Microzoft_Ofiz" = "C:\%WinDir%\KdzEregli.exe"  

Where %WinDir% is the main Windows folder.

Spreading in e-mails

It send emails with subject:

Listen and Smile  

And body:

Hey. I beg your pardon. You must listen.  

The attached file will be named:



When the virus is run, it uses the Windows Speech Engine to speak the following message:

How are you. I am back. My name is mister hamsi. I am seeing you. Haaaaaaaa.   You must come to turkiye. I am cleaning your computer. 5. 4. 3. 2. 1. 0. Gule. Gule.  

To listen to what the message sounds like, listen to this audio file:

If the day of the month is 10th or 23rd, the worm will attempt to delete all INI files from the Windows folder.

If the day of the month is 2nd, 15th or 17th, the worm will attempt to delete all DLL files from the Windows folder.


Detection for Amus.A worm is available since the following FSAV updates:

Detection Type: PC
Database: 2004-08-05_02

Technical Details:Ero Carrera, August 5th, 2004


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